Syntax of command line arguments - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare the main function with command line arguments.

C

int main(int [1], char *argv[]) {
    return 0;
}

Drag options to blanks, or click blank then click option'

Aargc

Bargv

Cargc[]

Dargs

Attempts:

3 left

💡 Hint

Common Mistakes

Using argv as the first parameter name instead of argc.

Adding brackets to argc like argc[].

The first parameter of main for command line arguments is argc, which counts the arguments.

2fill in blank

medium

Complete the code to access the first command line argument (excluding program name).

C

printf("First argument: %s\n", [1][1]);

Drag options to blanks, or click blank then click option'

Aargv[]

Bargc

Cargs

Dargv

Attempts:

3 left

💡 Hint

Common Mistakes

Using argc instead of argv to access arguments.

Trying to access argv with brackets like argv[].

The array argv holds the command line arguments as strings. Index 1 is the first argument after the program name.

3fill in blank

hard

Fix the error in the main function declaration for command line arguments.

C

int main([1] argc, char *argv[]) {
    return 0;
}

Drag options to blanks, or click blank then click option'

Afloat

Bvoid

Cint

Dchar

Attempts:

3 left

💡 Hint

Common Mistakes

Using void or char instead of int for argc.

Omitting the type before argc.

The first parameter argc must be of type int to hold the count of arguments.

4fill in blank

hard

Fill both blanks to declare main with command line arguments correctly.

C

int main([1] argc, [2] *argv[]) {
    return 0;
}

Drag options to blanks, or click blank then click option'

Aint

Bchar

Cfloat

Dvoid

Attempts:

3 left

💡 Hint

Common Mistakes

Using float or void types.

Swapping the types of the parameters.

The first parameter is int argc and the second is char *argv[] to hold argument strings.

5fill in blank

hard

Fill all three blanks to print all command line arguments using a loop.

C

for (int [1] = 0; [2] < [3]; [1]++) {
    printf("Arg %d: %s\n", [1], argv[[1]]);
}

Drag options to blanks, or click blank then click option'

Ai

Bargc

Ccount

Dn

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names inconsistently.

Comparing to a variable other than argc.

Use i as the loop variable and compare it to argc to loop through all arguments.